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Dermatosis papulosa nigra (DPN) is a condition of many small, benign skin lesions on the face, a condition generally presenting on dark-skinned individuals. [1]: 638–9 DPN is extremely common, affecting up to 30% of Black people in the US. [2] From a histological perspective, DPN resembles seborrheic keratoses. [3]
Data on the chances of transformation from melanocytic nevus to melanoma is controversial, but it appears that about 10% of malignant melanomas have a precursor lesion, of which about 10% are melanocytic nevi. Therefore, it appears that malignant melanoma quite seldom (1% of cases) has a melanocytic nevus as a precursor.
A study examining over 4,000 biopsied skin lesions identified clinically as seborrheic keratoses showed 3.1% were malignancies. Two-thirds of those were squamous cell carcinoma. [11] To date, the gold standard in the diagnosis of seborrheic keratosis is represented by the histolopathologic analysis of a skin biopsy. [12]
This is a shortened version of the twelfth chapter of the ICD-9: Diseases of the Skin and Subcutaneous Tissue. It covers ICD codes 680 to 709. The full chapter can be found on pages 379 to 393 of Volume 1, which contains all (sub)categories of the ICD-9. Volume 2 is an alphabetical index of Volume 1.
Jessner lymphocytic infiltrate of the skin is a cutaneous condition characterized by a persistent papular and plaque-like skin eruption which can occur on the neck, face and back and may re-occur. This is an uncommon skin disease and is a benign collection of lymph cells. Its cause is not known and can be hereditary.
Palisaded encapsulated neuroma (PEN) is a rare, benign cutaneous condition characterized by small, firm, non-pigmented nodules or papules. [1] [2] They typically occur as a solitary (single) lesion near the mucocutaneous junction of the skin of the face, although they can occur elsewhere on the body.
The acral nevus is a benign skin lesion that can occur at any age, but is generally noticed between 10 and 30 years of age. Both children and adults may be observed with this skin lesion. The prevalence of acral nevi increases directly with degree of skin pigmentation.
A spider angioma or spider naevus (plural: spider naevi), also nevus araneus, is a type of telangiectasis [2] (swollen, spider-like blood vessels on the skin) found slightly beneath the skin's surface, often containing a central red spot and deep reddish extensions (see Blood color) which radiate outwards like a spider's web or a spider's legs.